Bash Substring

In this tutorial, you will learn the technique that will help you in getting substring of a string. Following is the syntax that you must follow in order to get a substring:

${variablename:position:length}

The above syntax returns a substring that starts from the position and goes till the number of chracters specified by the length parameter.

The first character of $variablename is at position 0. Here length is optional. If you do not specify the length then it will return a substring that starts at position and goes till the end of $variablename.

To get substring when position and length are provided

mystr="BashShellScripting"
substr=${mystr:9:6}
echo "Substring is $substr"

Output of the above program

Substring is Script

To get substring when only position is provided

mystr="BashShellScripting"
substr=${mystr:4}
echo "Substring is $substr"

Output of the above program

Substring is ShellScripting

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